21346284988 has 18 divisors (see below), whose sum is σ = 42694116248. Its totient is φ = 9148076520.

The previous prime is 21346284983. The next prime is 21346285013. The reversal of 21346284988 is 88948264312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21346284983) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 759303 + ... + 786913.

Almost surely, 2^21346284988 is an apocalyptic number.

21346284988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21346284988 is an abundant number, since it is smaller than the sum of its proper divisors (21347831260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21346284988 is an frugal number, since it uses more digits than its factorization.

21346284988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55233 (or 27620 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 55.

The spelling of 21346284988 in words is "twenty-one billion, three hundred forty-six million, two hundred eighty-four thousand, nine hundred eighty-eight".